Filter-leaf construction



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E. J. SWEETLAND. FILTER LEAF CONSTRUCTION.

APPLICATION FILED MAR. 1. I916.

Patented Dec 2, 1919.

UNITED- 'sTAT s ATENToEEIc Emmsi J. SWEETLAND, OF MONTGLAIR,'NEW aE'asEY, ASSIGNOR, BY mEsn'E AssmnmEms, '10 UNITED FILTERS CORPORATION, A conroaarron or DELAWARE.

I ILTER-LEAE consrnuc'rron.

"To all whom it ma concern} LAND, a citizen of the United States, residing in the town of Montclairgin the county of Essex; and State of New Jersey, have invented certain new and useful Improvements in Filter-Leaf Constructions, of

v which the following is aspecificationz My invention relatesto improvements in .filter leaf devices, particularly that type of device in which the filter medium is cloth or 'imil'ar fabric, usually mounted upon a frame, which holds it in position. In the prior devices of this general 'construction 16 such for nstance as that shown and described in my'United States Letters Patent No.'-1,083,305 the frame may take the form of a ring within which is a central spacing member designed to afford a drainage area, 20 and on. each side of this spacing member a layer of .cloth is provided to act a filter medium. It is, of course, necessary inthis i type of filter that there shall be such a joint between the sections'of cloth forming the filter medium that the sludge or residue from filtration will not find any interstices through which it may pass into the interior of the leaf. As shown in my prior patent above re- 80 ferred to, it has been customary to sew the cloth in such a way as ,to accomplish this purpose, but thissewing operation is expensive and in many ways unsatisfactory, since from its nature, it. is a permanent 85 means of edging the sections of the filter clothtogether, whereas there frequently arises a need for disassembling the parts of the filter leaf. When a sewn filter leaf is 40 stitches inorder to take the leaf apart.

One of themain objects of my present invention is to do away with the necessity of any stitching of the cloth or. other fabric that forms thevfilter medium.' This I accomplish by providing 'suitable clamping means preferably cooperating with interlocking devices on the filter frame, so that the sections of filter fabric may be detach-- ably clamped in position without the need for any stitching whatever. My invention also contemplates certain other improvements in the construction of the filter leaf frame, drainage means and its associated parts as will more fully appear.

In the accompanying drawings, which Specification of Letters Patent. Application filed March 7,1916. Serial No. 82,637.'

edges of the cloth Patented Dec. 2, 1919.

a front elevation of a filter leaf of a type designed to be used in connection with the type of filter shown in my Patent No.

' enlarged central sectional view of a modified form of construction showing the clamping means in detail. Fig. 4 is a sectional view form a part of the specification, Figure 1 is Be it known t at I, ERNEST-J. SwEET-" on line 4l4 of Fig. 3'. Fi 5 is a view similar to Fig. 3 showing a urther modification of which Fig. 6 is. a transverse sectional view. Fig. 7 is a transverse sectional view showing a further modification.

Referring to the drawings in detail, the numeral 1 designates a filter leaf frame, which may preferably be formed from a ring of tubing bent-into 'the shape shown in Fig. 2 and having aperipheral channel 2 and a smaller'chan'nel 3 formed on its inter-- v nal circumference. .A disk 40f any suitable spacing material, such as coarse screen, is

centrally mounted within the ring and has its outer edge receivedwithin the channel 3.

The legsof this channel are I preferably criinped inward, as shown at 5 and 6, to clamp the spacing disk firmly in place.

Over one face of this disk is spread a some what .larger disk 7 of filter fabric,'.which has its outer edge or periphery folded over or looped into the peripheral channel 2. as clearly shown in Fig. 2. A second similar disk 8 of filter fabric covers the other face of the spacing disk and its edge is similarly looped into channel 2, being folded over the loop of the first disk. In order to retain the two sections of filter cloth in place some used, it is of course necessary to rip out thev cloth. The T member is preferably in the form of a hoop, as shown in Fig. 1, and any suitable means may be provided for forcing the leg 9 -into the peripheral channel 2, such for instance, asthe tension device 10 fur nished by the lugs 11 and 12 and the bolt 13 connecting them, the lugs being secured to the flange of the T in any suitable way, as l by brazing or soldering. It will be obvious that when the ring or hoop is placed in tension by screwing up the nut 13 on the bolt 14 not only will the leg 9 be forced into the channel 2, thus clamping the two looped firmly in place; but the flange of the T-ring will be forced down a ainst theportions 15 and 16 of the cloth, wichpassover the top edges of thachannel. -This construction insures a joint between the cloth and the ring frame that will obviate any possibility of the impurities in the fluid to be filtered passing into the interior drainage area afforded by the drainage prov disk 4. The usual drainage pipe 17. is vided for leading the clear filtrate to the outlet manifold." 1

Figs. 3 and show i modification in which the tubular ring frame is supplanted by a solid ring 18 provided with the channels.

quate amount of adjustment of the bolt and nut which connect thelugs. This construction maintains the two abutting ends of the locking ring, in alinement,

.Figs. 5 and 6 show a further modification in which a cord or wire 22 is substituted for the locking ring above described. This cord, which may preferably be sash cord or the like is driven into thev peripheral channel 2 after the cloth has been looped over it on -both sides and will retain the cloth permanently in place. The outer ends of the channel 2 may preferably be forced together slightly either before or after the insertion of the cord, so as to aid in retaining it in place. After the cord is subjected to moisture, as it will be in the filter, it will tend l to swell and this action will clamp the cloth all the more tightly against the inner walls of the channel. I

In Fig. 7 I have shown a further modification in .which the tubular frame is replaced by-a pressed metal. construction. In thisform, there is a peripheral channel 23 corresponding to the channel-2, the metal being-folded back'upon itself to form the; two inwardly extending. flanges 2,4 and 25,

between which the spacing disk-is received. The disk may merely be clampedbetween these two by: their own resiliency-or may be riveted thereto atintervals by means 7 of'zivets 26. this figure, the cloth is shown as clinging aosely to the spacing disk.

.This is the position which the cloth actu-' ally as'sumes in'thefilter when it isjin operation, smce -there 1s a-hquidpressureacting'in the direction-of the arrows as the filtrate passes through the'filter medium into the central drainage section of the leaf.

Figs. 2, 4 and 6, on theotherhand, show the fabric having a channel and means for ric'in-said channel. 3

7. In a filter leaf, a peripheral frame'havassume when the filter is not in operation. e It will be appreciated that,'while I have used the general form of filter leaf shown .in my Patent No. 1,083,305 for purposesof illustration, the features of m invention are applicable to many other types of filter construction. Furthermore, while I. have illustrated and described only certain embodiments of my invention, I realize that it is susceptible of wide application, and I donot desire to. be limited to the specific forms shown and described.

Having thus described my invention, I {claim'rs i 1. In a filter leaf,a peripheral frame and an annular clamping ring surrounding the peripheral frame, one ofsaid members being formed with a channel and the other of said members being formed with lateral portions adapted'to engage the side walls of the channel and alsoh web adapted to enter the channel, in combination with a section of filter fabric having a portion thereof received within the channel. 2. In a filter leaf, a peripheral frame and an annular clamping ring surrounding the same, one of said' members being formed with a channel and the other having a T- shaped cross section and arranged so that -the central web thereof will enter the channel, in combination with a section of filter portion thereof received within the channe 3. In a filter leaf, a peripheral formed with a channel, filter fabricgi 'gwerings having the edges thereof received Within the channel, and,an annular clamping ring extending around'the peripheral. frame and havin portions which clamp the filter fabric wit in thechannel andfaalaoyat the edges thereof. 4. "In a filter leaf, nel therein,'a sectionof filterfabric'havin a portion entering 4 said channel and a locking ring having its web entering said a frame hai inga chanchannel for clamping the fabric to the frame.

f 5.1 In a filter leaf, a frame having a chansaid channel to clamp the fabric therein in place within the frame.

6, In a filter leaf, a frame having a dou.-'

bleichannel, a spacing member having its edgereceiVed-in oneofthe channels, a section of filter "fabric covering said member and having a portion received in the other clamping said faban. inner channel and an outer channel,-

a spacing member having its edge received cloth in the position Whlohit will ,nor-

in the inner channel, .a section of filtsr fab and a flange adapted to clamp the fabric ,8. In a filter leaf, a peripheral frame haw ing an inner channel and an outer channel, agcentral' spacing member having its edge rreceivedin the filter fabric. covering one face of said memher, a second section of filter-fabriccover-- 10 ingtheother faceof saidmember, each of inner channel, a section of in the opposite direction.

" said sections having a'portion received in th outer channel and means for clamping said portion therein.

9. A per1p and the llke, comprising a tubular member having a depression in its outer edge to form a peripheral channel and a depression in its inner edge forming a similar channel facing E. J; SWEETLAND.

heral frame for filter leaves 

